| Value | Category | Cases | |
|---|---|---|---|
| 1 | a.No difficulty | 13382 |
83.6%
|
| 2 | b.Some difficulty | 272 |
1.7%
|
| 3 | c.A lot of difficulty | 91 |
0.6%
|
| 4 | d.Cannot do at all | 77 |
0.5%
|
| Missing value | 2184 |
13.6%
|